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Cosm is an integrated collection of extensions to Max/MSP/Jitter to assist the construction of navigable, sonified, complex virtual worlds, and has been designed to facilitate use in CAVE-like environments.

The worlds first OpenSource Realtime Editing and Effects System. Jahshaka takes advantage of the power of OpenGL and OpenML to give its users exceptional levels of performance. We currently support Linux, OsX, Irix and Windows, and Solaris is on the way!

remaking the classic 1984 arcade game Marble Madness by Atari. The graphics are slightly enhanced to bring them on par with modern standards: there is now a full 3D mode in addition to the usual isometric perspective one

Brought up several times in our forums and elsewhere over the past few days has been VMware's Gallium3D driver that they use for guest 3D acceleration on their proprietary virtualization platform.
Compared to Oracle's VM VirtualBox graphics acceleration support that is quite slow for OpenGL and often unreliable or the limited attempts at OpenGL QEMU acceleration, VMware has a rather nice acceleration architecture built atop Gallium3D. Using Gallium3D at the heart of their graphics driver implementation across platforms shouldn't be surprising though since they bought out Tungsten Graphics in late 2008 and its these Mesa / Gallium3D drivers now developing VMware's graphics stack.

gestalt_p5
Gestalt is an open structured environment, designed to prototype and develop OpenGL- and Java-based sketches and applications. It is also a library for the programming environment processing. Last update,

Espresso3D is a high performance real-time 3D engine for the Java(tm) programming language. E3D is not just a scene graph. It aims to be a complete solution for your application with OpenGL rendering, OpenAL audio, collision detection, input, and rendering support.
Espresso3D began as a free for non-commercial use library in October 2004. As of April 8, 2008 Espresso3D is available under the open source LGPL license.

Taksi is a utility that allows you to take screenshots and record video clips of your favourite games and other 3D-graphics applications. Inspired by Fraps (www.fraps.com), Taksi aims to provide an open source alternative to that great tool.
Taksi can support live video compression with any VFW video codec your system has installed (i.e. XVid, DivX, MS Mpeg4, etc).